Driving circuit, driving method and display device

Abstract

The invention discloses a driving circuit, the driving circuit is used for driving a display panel, the driving circuit comprises a leakage current generation module and a grid low-voltage output module, the leakage current generation module is connected with any data line in the display panel, generates leakage current and outputs the leakage current to the connected data line; the grid low-voltage output module is connected with the leakage current generation module; the grid low-voltage output module determines a voltage value of a grid low voltage output to a data line of the display panel based on a current value of the leakage current generated by the leakage current generation module so as to generate a corresponding grid low-voltage driving signal and output the grid low-voltage driving signal to the data line of the display panel; and adjusting the current value of the leakage current on the data line in the display panel to the minimum value. By adjusting the voltage value of the gate low voltage output to the gate line of the display panel, the current value of the leakage current on the data line reaches the minimum value, the crosstalk problem caused by the leakage current is solved, and the display effect is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a driving circuit, a driving method and a display device. Background Art

[0002] As liquid crystal display (LCD) panels become larger and larger, LCD panel technologies have been widely adopted, especially in the high-end display sector, where significant progress has been made in LCD panel technology. TFT (Thin Film Transistor Liquid Crystal Display) is a special type of LCD display. Unlike traditional LCDs, TFT LCDs use thin-film transistors to control the brightness and color of each pixel. This means each pixel has an independent transistor, allowing for more precise control of light transmission, resulting in higher resolution and better image quality.

[0003] In recent years, demand for display quality has become increasingly stringent, and the market share of large-scale, high-resolution displays has gradually increased. This has led to the emergence of 8K ultra-high-definition displays. Compared to 4K displays, 8K offers a substantial improvement in image quality and can also be integrated with 5G to provide a more comprehensive sensory experience. However, high-specification products also come with more display issues, one of which is vertical crosstalk. This phenomenon occurs when the display of one area in the vertical direction is affected by another area, resulting in image distortion. Vertical crosstalk is caused by the leakage current Ioff when the thin-film transistor (TFT) is turned off, which causes the pixel voltage to shift, affecting the display quality. Summary of the Invention

[0004] The purpose of this application is to provide a driving circuit, a driving method and a display device that can improve crosstalk and enhance display effects.

[0005] The present application discloses a driving circuit for driving a display panel, the driving circuit including a leakage current generating module and a gate low voltage output module, the leakage current generating module being connected to any data line in the display panel to generate a leakage current and output it to the connected data line; the gate low voltage output module being connected to the leakage current generating module to generate a gate low voltage based on the current value of the leakage current generated by the leakage current generating module; wherein the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generating module to generate a corresponding gate low voltage driving signal to be output to the gate line of the display panel, thereby adjusting the current value of the leakage current on the data line in the display panel to a minimum value.

[0006] Optionally, the leakage current generating module includes a first thin film transistor; the gate low voltage output module includes a filtering unit, a current amplifying unit, a resistor voltage divider unit and a power chip; the control end of the first thin film transistor is connected to the power chip, the input end is connected to any data line in the display panel, and the output end is connected to the input end of the filtering unit; the output end of the filtering unit is connected to the input end of the current amplifying unit, and outputs the filtered leakage current to the current amplifying unit; the output end of the current amplifying unit is connected to the input end of the resistor voltage divider unit, and outputs the amplified leakage current to the resistor voltage divider unit; the output end of the resistor voltage divider unit is connected to the power chip, and outputs the divided voltage to the power chip; wherein the first thin film transistor and the thin film transistor in the pixel are formed by the same process, and have the same model and size, and the leakage current value generated is equal in size, and the power chip generates a corresponding gate low voltage drive signal based on the divided voltage and outputs it to the gate line of the display panel, so as to minimize the leakage current value on the data line in the display panel.

[0007] Optionally, the leakage current generating module includes a first thin film transistor and a second thin film transistor, and the gate low voltage output module includes a leakage current adding unit, a filtering unit, a current amplifying unit, a resistance voltage dividing unit and a power supply chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are respectively the first data line and the nth data line; the control end of the first thin film transistor and the control end of the second thin film transistor are respectively connected to the power supply chip, the input end of the first thin film transistor is connected to the first data line in the display panel, and the input end of the second thin film transistor is connected to the nth data line in the display panel; the output end of the first thin film transistor and the output end of the second thin film transistor are respectively connected to the leakage current adding unit, and the leakage current adding unit collects the leakage current from the first thin film transistor and the second thin film transistor. The leakage current is added and calculated; the output end of the leakage current adding unit is connected to the input end of the filtering unit; the output end of the filtering unit is connected to the input end of the current amplifying unit, and the filtered leakage current is output to the current amplifying unit; the output end of the current amplifying unit is connected to the input end of the resistor divider unit, and the amplified leakage current is output to the resistor divider unit, and the output end of the resistor divider unit is connected to the power supply chip, and the divided voltage is output to the power supply chip; wherein, the first thin film transistor and the second thin film transistor are formed by the same process as the thin film transistor in the pixel, and have the same model size, and the leakage current values ​​generated are equal in size, and the power supply chip generates a corresponding gate low voltage drive signal based on the divided voltage and outputs it to the gate line of the display panel, so as to minimize the leakage current value on the data line in the display panel.

[0008] Optionally, the leakage current generating module includes a pixel unit, and the gate low voltage output module includes a voltage storage unit, a switch control unit and a power supply chip. The input end of the switch control unit is connected to the pixel unit through a data line, and controls the leakage current output by the pixel unit to the data line to be input to the voltage storage unit. The power supply chip generates a corresponding gate low voltage drive signal according to the voltage value stored in the voltage storage unit and outputs it to the gate line of the display panel, so as to minimize the leakage current value on the data line in the display panel.

[0009] Optionally, the driving circuit also includes a temperature detection module and a brightness detection module, and the temperature detection module and the brightness detection module are respectively connected to the current amplification unit, the temperature detection module is used to detect the temperature value of the display panel in real time, and control the amplification factor of the leakage current of the current amplification unit according to the temperature value; the brightness detection module is used to detect the brightness value of the display panel in real time, and control the amplification factor of the leakage current of the current amplification unit according to the brightness value.

[0010] Optionally, the leakage current generating module includes a first thin film transistor and a second thin film transistor, and the gate low voltage output module includes a leakage current input control unit, a filtering unit, a current amplifying unit, a resistance voltage dividing unit and a power chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are the first data line and the nth data line respectively; the leakage current input control unit includes a timing control circuit, a first switch and a second switch, and the timing control circuit outputs a switch control signal to control the conduction of the first switch and the second switch; the first switch is turned on at a low level and turned off at a high level, and the second switch is turned off at a low level and turned on at a high level; the control end of the first thin film transistor is connected to the power chip through the first switch, and the control end of the second thin film transistor is connected to the power chip through the first switch, the input end of the first thin film transistor is connected to the first data line in the display panel, and the input end of the second thin film transistor is connected to the first data line in the display panel. connected to the nth data line in the display panel; the output end of the first thin film transistor and the output end of the second thin film transistor are respectively connected to the input end of the filtering unit; the output end of the filtering unit is connected to the input end of the current amplifying unit, and outputs the filtered leakage current to the current amplifying unit; the output end of the current amplifying unit is connected to the input end of the resistor divider unit, and outputs the amplified leakage current to the resistor divider unit; the output end of the resistor divider unit is connected to the power supply chip, and outputs the divided voltage to the power supply chip; wherein, the first thin film transistor and the second thin film transistor are formed by the same process as the thin film transistors in the pixel, and have the same model and size, and the leakage current values ​​generated are equal in size, and the power supply chip generates a corresponding gate low voltage drive signal based on the voltage generated by filtering, amplifying and dividing the leakage currents generated by different thin film transistors, and outputs it to the gate line of the display panel, so that the leakage current value of the data line in the display panel is minimized at different times.

[0011] Optionally, the driving circuit also includes a storage module, which stores a first lookup table formed based on a relationship curve between the leakage current value and the gate low voltage, and the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generating module and the first lookup table.

[0012] The present application also discloses a driving method, which is used for any of the above driving circuits to drive a display panel. The driving method includes: Obtaining a current value of a leakage current on a data line within a display panel; The voltage value of the gate low voltage output to the gate line of the display panel is determined according to the current value of the leakage current to generate a corresponding gate low voltage drive signal output to the gate line of the display panel, thereby adjusting the current value of the leakage current on the data line in the display panel to a minimum value.

[0013] Optionally, the leakage current generating module includes a pixel unit, the gate low voltage output module includes a voltage storage unit, a switch control unit and a power chip, and the input end of the switch control unit is connected to the pixel unit through a data line; The step of obtaining the current value of the leakage current on the data line in the display panel includes: During a first time period, an unadjusted gate low voltage is output to the gate line of the display panel, a grayscale data signal corresponding to a white screen is output to the data line, and the switch control unit is controlled to be turned off; In a second time period, an unadjusted gate high voltage is output to the gate line of the display panel, a zero grayscale data signal is output to the data line, and the switch control unit is controlled to be turned on to obtain a leakage current on the data line in the display panel; The step of determining a gate low voltage value output to the gate line of the display panel based on the detected leakage current value to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and adjusting the leakage current value on the data line in the display panel to a minimum value includes: In the second time period, the voltage storage unit receives the leakage current on the data line and converts the leakage current into a corresponding voltage value; After a preset time, the voltage value of the gate low voltage output to the gate line of the display panel is determined based on the voltage value of the voltage storage unit to generate a corresponding gate low voltage drive signal output to the gate line of the display panel, thereby adjusting the current value of the leakage current on the data line in the display panel to a minimum value.

[0014] The present application also discloses a display device, which includes a display panel and any of the driving circuits described above, wherein the driving circuit drives the display panel using any of the driving methods described above.

[0015] Compared with the solution of adjusting the data voltage to improve the crosstalk problem, the present application sets up a driving circuit, which obtains the current value of the leakage current on the data line in the display panel, determines the voltage value of the gate low voltage output to the gate line of the display panel according to the current value of the leakage current, and generates a corresponding gate low voltage driving signal output to the gate line of the display panel, so as to adjust the current value of the leakage current on the data line in the display panel to the minimum value. When the display panel is displaying, the crosstalk problem is improved by reducing the leakage current value, thereby improving the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings: Figure 1 is a schematic structural diagram of a display panel and a driving circuit in a first embodiment of the present application; Figure 2 is a schematic structural diagram of a display panel and a driving circuit in a second embodiment of the present application; Figure 3 is a schematic structural diagram of a display panel and a driving circuit in a third embodiment of the present application; Figure 4 is a schematic structural diagram of a display panel and a driving circuit in a fourth embodiment of the present application; Figure 5 is a schematic structural diagram of another display panel and a driving circuit in a fourth embodiment of the present application; Figure 6 is a schematic structural diagram of a display panel and a driving circuit in a fifth embodiment of the present application; Figure 7 is a graph showing the relationship between the gate low voltage and the leakage current in the fifth embodiment of the present application; Figure 8 is a schematic structural diagram of a display panel and a driving circuit in a sixth embodiment of the present application; Figure 9 is a structural diagram of another display panel and a driving circuit according to a sixth embodiment of the present application; Figure 10 is a flowchart of a driving method according to a seventh embodiment of the present application; Figure 11 is a schematic flow chart of a driving method according to an eighth embodiment of the present application; Figure 12 It is a schematic structural diagram of a display device according to the ninth embodiment of the present application.

[0017] Among them, 100, driving circuit; 110, leakage current generating module; 111, first thin film transistor; 112, second thin film transistor; 113, pixel unit; 120, gate low voltage output module; 121, filtering unit; 122, current amplifying unit; 123, resistor voltage divider unit; 124, power chip; 125, leakage current adding unit; 126, leakage current input control unit; 1261, timing control circuit; 127, voltage storage unit; 128, switch control unit; 130, temperature detection module; 140, brightness detection module; 150, storage module; 160, control board; 170, flip chip; 200, display panel; 210, display area; 220, non-display area; 300, display device; First data line S1; nth data line Sn; gate lines G1 to Gn; gate low voltage VGL; gate high voltage VGH; first switch Q1; second switch Q2; capacitor C; first control switch T1. DETAILED DESCRIPTION

[0018] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0019] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0020] refer to Figure 1 As shown, as a first embodiment of the present application, a driving circuit 100 is disclosed, which is used to drive a display panel 200. The driving circuit 100 includes a leakage current generating module 110 and a gate low voltage output module 120. The leakage current generating module 110 is connected to any data line in the display panel 200, generates a leakage current and outputs it to the connected data line; the gate low voltage output module 120 is connected to the leakage current generating module 110, and generates a gate low voltage based on the current value of the leakage current generated by the leakage current generating module 110; wherein the gate low voltage output module 120 determines the voltage value of the gate low voltage output to the gate line of the display panel 200 based on the current value of the leakage current generated by the leakage current generating module 110, so as to generate a corresponding gate low voltage driving signal and output it to the gate line of the display panel 200, thereby adjusting the current value of the leakage current on the data line in the display panel 200 to a minimum value.

[0021] Considering that data line leakage current may cause unexpected flow of charge between adjacent pixels, causing uneven brightness in the vertical direction (i.e., vertical crosstalk), the present application mainly suppresses data line leakage by dynamically adjusting the gate low voltage VGL, thereby eliminating the crosstalk inducement from the source. Specifically, by accessing the data line, obtaining or detecting the leakage current value on the data line, and determining the gate low voltage value output to the gate line of the display panel 200 based on the current value of the leakage current generated by the leakage current generating module 110, so as to generate a corresponding gate low voltage drive signal output to the gate line of the display panel 200, and adjust the current value of the leakage current on the data line in the display panel 200 to the minimum value. Minimizing the leakage current can reduce invalid power loss, improve crosstalk problems, and enhance display effects. In addition, the present application is to detect leakage current in real time, and environmental changes, such as temperature and light intensity, have an impact on the performance of thin film transistors (TFTs). The characteristic curve of transistor (TFT) will be affected, that is, the optimal gate low voltage VGL is different in different environments. Therefore, it is considered to adjust the gate low voltage VGL synchronously when the environment changes. The gate low voltage VGL selected corresponds to the minimum leakage current, and the gate low voltage VGL at this time is the optimal gate low voltage VGL.

[0022] refer to Figure 2 As shown, as the second embodiment of the present application, it is a further refinement and improvement of the above-mentioned first embodiment. Specifically, the leakage current generating module 110 includes a first thin film transistor 111; the gate low voltage output module 120 includes a filtering unit 121, a current amplifying unit 122, a resistor voltage dividing unit 123 and a power chip 124; the control end of the first thin film transistor 111 is connected to the power chip 124, the input end is connected to any data line in the display panel 200, and the output end is connected to the input end of the filtering unit 121; the output end of the filtering unit 121 is connected to the input end of the current amplifying unit 122, and the filtered leakage current is output to the current amplifier 122. The large unit 122; the output end of the current amplifying unit 122 is connected to the input end of the resistor divider unit 123, and the amplified leakage current is output to the resistor divider unit 123. The output end of the resistor divider unit 123 is connected to the power chip 124, and the divided voltage is output to the power chip 124. The first thin film transistor 111 is formed by the same process as the thin film transistor in the pixel, and has the same model size, and the leakage current value generated is equal in size. The power chip 124 generates a corresponding gate low voltage drive signal based on the divided voltage and outputs it to the gate line of the display panel 200, so as to minimize the leakage current value on the data line in the display panel 200.

[0023] In this embodiment, when the display panel 200 is manufactured, the thin film transistors in the display panel 200 and the first thin film transistor 111 are formed using the same manufacturing process. The leakage current of the first thin film transistor 111 represents the leakage current of the thin film transistor in the display panel 200. The first thin film transistor 111 is arranged in the non-display area 220 of the display panel 200, which is equivalent to pulling out the thin film transistor in the display panel 200 to detect the leakage current of the thin film transistor. The first thin film transistor 111 is arranged at the edge of the non-display area 220 of the display panel 200. The control end of the first thin film transistor 111 is connected to the power chip 124 to receive the gate low voltage drive signal output by the power chip 124. The input end of the first thin film transistor 111 is connected to the data line. The current output by the output end is the leakage current Ioff. The output leakage current passes through the chip-on-chip film 170 (Chip The leakage current Ioff is input to the control board 160 and filtered to remove high-frequency noise. Since the leakage current Ioff of a single TFT is very small, it needs to be amplified before it can be detected. The voltage divided by the resistor is then fed back to the power chip 124 through resistor division. A larger voltage represents a larger leakage current. Based on the detected feedback voltage, the power chip 124 adjusts the voltage value of the gate low voltage VGL to minimize the leakage current.

[0024] refer to Figure 3As shown, as the third embodiment of the present application, it is a further refinement and improvement of the above-mentioned first embodiment. Different from the above-mentioned second embodiment, the leakage current generating module 110 includes a first thin film transistor 111 and a second thin film transistor 112, and the gate low voltage output module 120 includes a leakage current adding unit 125, a filtering unit 121, a current amplifying unit 122, a resistance voltage dividing unit 123 and a power chip 124; along the scanning direction of the scanning line of the display panel 200, the two data lines close to the two sides of the display panel 200 are respectively the first data line and the nth data line; the control end of the first thin film transistor 111 and the control end of the second thin film transistor 112 are respectively connected to the power chip 124, the input end of the first thin film transistor 111 is connected to the first data line in the display panel 200, and the input end of the second thin film transistor 112 is connected to the nth data line in the display panel 200; the output end of the first thin film transistor 111 and the output end of the second thin film transistor 112 are respectively connected to the leakage current adding unit 125, The leakage current adding unit 125 adds the leakage current collected from the first thin film transistor 111 and the second thin film transistor; the output end of the leakage current adding unit 125 is connected to the input end of the filtering unit 121; the output end of the filtering unit 121 is connected to the input end of the current amplifying unit 122, and outputs the filtered leakage current to the current amplifying unit 122; the output end of the current amplifying unit 122 is connected to the input end of the resistor divider unit 123, and outputs the amplified leakage current to the resistor divider unit 123; the output end of the resistor divider unit 123 is connected to the power chip 124, and outputs the divided voltage to the power chip 124; wherein the first thin film transistor 111 and the second thin film transistor 112 are formed by the same process as the thin film transistors in the pixel, and have the same model and size, and the leakage current values ​​generated are equal in magnitude; the power chip 124 generates a corresponding gate low voltage driving signal based on the divided voltage and outputs it to the gate line of the display panel 200, so as to minimize the leakage current value on the data line in the display panel 200.

[0025] In this embodiment, considering that detecting both ends can measure the overall OC situation, when the display panel 200 is large, the environments at the left and right ends may be different. Therefore, the gate low voltage VGL can be set to an intermediate value to minimize the leakage current of the left and right ends. Therefore, a thin film transistor TFT is added to each end of the display panel 200, namely a first thin film transistor 111 and a second thin film transistor 112. The control terminals of these two transistors are connected to the power chip 124 and receive the VGL output by the power chip 124. The input terminals of these two transistors are connected to the data lines at both ends. The current output by the other terminals is the leakage current Ioff, which is input to the control board 160 through the COF. The TFTs at both ends of the display panel 200 are summed on the control board 160. This is done to avoid uneven heating and lighting at both ends of the panel. The sum is used to detect the leakage current of the entire panel. The leakage current Ioff is then filtered to remove high-frequency noise. Since the leakage current Ioff of a single TFT is very small, it needs to be amplified before it can be detected. The voltage divided by the resistor is then fed back to the power chip 124 (POWERIC) using a resistor divider. The larger the voltage, the greater the leakage current. After detecting the feedback voltage, the POWER IC adjusts the voltage value of the gate low voltage VGL to minimize the leakage current.

[0026] refer to Figure 4 As shown, as the fourth embodiment of the present application, it is also a further refinement and improvement of the first embodiment. The difference from the third embodiment is that, with reference to 4 Figure 5As shown, the leakage current generating module 110 includes a first thin film transistor 111 and a second thin film transistor 112, and the gate low voltage output module 120 includes a leakage current input control unit 126, a filtering unit 121, a current amplifying unit 122, a resistor voltage divider unit 123 and a power chip 124; along the scanning direction of the scanning line of the display panel 200, the two data lines close to the two sides of the display panel 200 are the first data line and the nth data line respectively; the leakage current input control unit 126 includes a timing control circuit 1261, a first switch and a second switch, and the timing control circuit 1261 outputs a switch control signal to control the conduction of the first switch and the second switch; the first switch is turned on at a low level and turned off at a high level, and the second switch is turned off at a low level and turned on at a high level; the control end of the first thin film transistor 111 is connected to the power chip 124 through the first switch, and the The control end of the second thin film transistor 112 is connected to the power chip 124 through the first switch, the input end of the first thin film transistor 111 is connected to the first data line in the display panel 200, and the input end of the second thin film transistor 112 is connected to the nth data line in the display panel 200; the output end of the first thin film transistor 111 and the output end of the second thin film transistor 112 are respectively connected to the input end of the filtering unit 121; the output end of the filtering unit 121 is connected to the input end of the current amplifying unit 122, and outputs the filtered leakage current to the current amplifying unit 122; the output end of the current amplifying unit 122 is connected to the input end of the resistance divider unit 123, and outputs the amplified leakage current to the resistance divider unit 123; the output end of the resistance divider unit 123 is connected to the power chip 124, and outputs the divided voltage to the power chip 124.

[0027] Among them, the first thin film transistor 111 and the second thin film transistor 112 are formed by the same process as the thin film transistors in the pixel, and have the same model and size, and the leakage current values ​​generated are equal. The power chip 124 filters, amplifies, and divides the leakage currents generated by different thin film transistors to generate corresponding gate low voltage drive signals, which are output to the gate lines of the display panel 200, so that the leakage current values ​​of the data lines in the display panel 200 are minimized at different times.

[0028] In this embodiment, two thin film transistors are added to both ends of the display panel 200. The two thin film transistors are independently controlled and each generates a VGL value corresponding to the minimum leakage current in different time periods. In a first time period, the timing control circuit 1261 outputs a switch control signal to control the first switch Q1 to be turned on and the second switch Q2 to be turned off. The leakage current on the first data line on the left is filtered by the filtering unit 121 and output to the current amplifying unit 122. The current amplifying unit 122 amplifies the filtered leakage current and outputs it to the resistor divider unit 123. The output end of the resistor divider unit 123 is connected to the power chip 124, and the divided voltage is output to the power chip 124. The power chip 124 filters, amplifies, and divides the leakage current generated by different thin film transistors to generate a corresponding gate low voltage drive signal and output it to the display panel. 200, so that the leakage current value of the data line in the display panel 200 is minimized; in the second time period, the timing control circuit 1261 outputs a switch control signal to control the first switch to be turned off and the second switch to be turned on, and the leakage current on the nth data line on the right is filtered by the filtering unit 121 and output to the current amplifying unit 122, the current amplifying unit 122 amplifies the filtered leakage current and outputs it to the resistor divider unit 123, the output end of the resistor divider unit 123 is connected to the power chip 124, and the divided voltage is output to the power chip 124, the power chip 124 filters, amplifies and divides the leakage current generated by different thin film transistors to generate a corresponding gate low voltage drive signal, which is output to the gate line of the display panel 200, so that the leakage current value of the data line in the display panel 200 is minimized.

[0029] refer to Figure 6 As shown, as the fifth embodiment of the present application, it is a further refinement and improvement of the above second to fourth embodiments, with reference to Figure 6 and Figure 7 As shown, the driving circuit 100 further includes a storage module 150, wherein the storage module 150 stores a relationship curve based on the leakage current value and the gate low voltage ( Figure 7 In the figure, the horizontal axis represents the gate low voltage input to the gate line, and the vertical axis represents the current value Ioff of the corresponding leakage current. The gate low voltage output module 120 determines the voltage value of the gate low voltage output to the gate line of the display panel 200 based on the current value of the leakage current generated by the leakage current generating module 110 and the first lookup table. After obtaining the current value of the leakage current, the optimal gate low voltage VGL can be determined by looking up the table. The optimal gate low voltage VGL is found and a corresponding gate low voltage driving signal is generated and output to the gate line in the display panel 200, thereby minimizing the leakage current on the data line.

[0030] In addition, the driving circuit 100 further includes a temperature detection module 130 and a brightness detection module 140, the temperature detection module 130 and the brightness detection module 140 are respectively connected to the current amplifying unit 122, the temperature detection module 130 is used to detect the temperature value of the display panel 200 in real time, and control the amplification factor of the leakage current of the current amplifying unit 122 by the temperature value; the brightness detection module 140 is used to detect the brightness value of the display panel 200 in real time, and control the amplification factor of the leakage current of the current amplifying unit 122 by the brightness value; considering that temperature and light will have an impact on the leakage current, although this embodiment What is obtained in the example is the real-time leakage current, that is, the leakage current value is equivalent to the leakage current after the influence of factors such as temperature or light has been added. However, considering that sometimes the temperature or light is strong, the current value of the leakage current is relatively large, so the amplification factor of the leakage current by the current amplification unit 122 is controlled by the temperature value or the brightness value to avoid the leakage current being too large when the temperature is too high, and exceeding the maximum amplification limit of the current amplification unit 122 during amplification, resulting in inaccurate amplified results; detecting the leakage current of the TFT and adjusting the voltage value of the gate low voltage at the same time can minimize the leakage current of the TFT of the display panel 200 under different temperatures and light.

[0031] refer to Figure 8 As shown, as the sixth embodiment of the present application, it is also a further refinement and improvement of the above-mentioned first embodiment, referring to Figure 8 and Figure 9 As shown, the leakage current generating module 110 includes a pixel unit 113, and the gate low voltage output module 120 includes a voltage storage unit 127, a switch control unit 128 and a power supply chip 124. The input end of the switch control unit 128 is connected to the pixel unit 113 through a data line, and controls the leakage current output by the pixel unit 113 to the data line to be input to the voltage storage unit 127. The power supply chip 124 generates a corresponding gate low voltage driving signal according to the voltage value stored in the voltage storage unit 127 and outputs it to the gate line of the display panel 200, so as to minimize the leakage current value on the data line in the display panel 200; wherein, the voltage storage unit 127 includes a capacitor, and the switch control unit 128 includes a first control switch.

[0032] In this embodiment, unlike the above-mentioned second embodiment, the leakage current corresponding to the pixel unit 113 is directly collected, the leakage current on the data line is introduced into the voltage storage unit 127 on the control board 160, and converted into a corresponding voltage value. The power chip 124 adjusts VGL according to the capacitor voltage in the voltage storage unit 127 to minimize the leakage current on the data line, thereby improving the vertical crosstalk problem.

[0033] refer to Figure 10 As shown, as a seventh embodiment of the present application, a driving method is disclosed, which is used for the driving circuit 100 described in any of the above embodiments to drive the display panel 200. The driving method includes: S1: Obtain the current value of the leakage current on the data line in the display panel; S2: Determine the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current to generate a corresponding gate low voltage drive signal output to the gate line of the display panel, and adjust the current value of the leakage current on the data line in the display panel 200 to a minimum value.

[0034] refer to Figure 1 and Figure 10 As shown, in this embodiment, the driving method is based on the above-mentioned driving circuit 100 to realize the driving of the display panel 200. By monitoring the leakage current on the data line in real time, the system can dynamically sense the leakage state of the pixel circuit, and dynamically adjust the voltage value of the gate low voltage based on the current value of the leakage current, so that the off state of the pixel circuit is close to the theoretical optimal value, thereby minimizing the leakage current.

[0035] As shown in FIG11 , as an eighth embodiment of the present application, a driving method is disclosed, which is mainly used in the driving circuit 100 in the fifth embodiment. The leakage current generating module 110 includes a pixel unit 113, and the gate low voltage output module 120 includes a voltage storage unit 127, a switch control unit 128 and a power chip 124. The input end of the switch control unit 128 is connected to the pixel unit 113 through a data line. Figure 8 、 Figure 9 and Figure 11 As shown, step S1 includes: S11: During a first time period, outputting an unadjusted gate low voltage to the gate line of the display panel 200 , outputting a grayscale data signal corresponding to a white image to the data line, and controlling the switch control unit 128 to be turned off; S12: During the second time period, outputting an unadjusted gate high voltage to the gate line of the display panel 200, outputting a zero grayscale data signal to the data line, and controlling the switch control unit 128 to be turned on to obtain leakage current on the data line in the display panel 200; The step S2 comprises: S21: In a second time period, the voltage storage unit receives a leakage current on the data line and converts the leakage current into a corresponding voltage value; S22: After a preset time, the voltage value of the gate low voltage output to the gate line of the display panel 200 is determined based on the voltage value of the voltage storage unit to generate a corresponding gate low voltage drive signal output to the gate line of the display panel 200, thereby adjusting the current value of the leakage current on the data line in the display panel 200 to a minimum value.

[0036] In this embodiment, during a first time period, any data line on the display panel 200 is led back to the control board 160 to charge the capacitor, and at the same time, the line is passed through the control switch unit, firstly causing the panel's gate to output a gate low voltage VGL and the data line to output a white screen. At this time, the storage capacitor is charged under the influence of the leakage current, and the switch control unit 128 on the control board 160 is in an off state; then the panel's gate is caused to output a gate high voltage VGH and the data line outputs 0, and the switch control unit 128 on the control board 160 is in an open state. The charge of the storage capacitor flows to the capacitor on the control board 160. After a preset time, the POWER IC detects the voltage of the capacitor. A larger voltage indicates a larger leakage current, so that the POWER IC adjusts the gate low voltage VGL according to the capacitor voltage to minimize the leakage current.

[0037] refer to Figure 12 As shown, as the ninth embodiment of the present application, a display device 300 is disclosed, which includes a display panel 200 and a driving circuit 100 as described above. The driving circuit 100 drives the display panel 200 using the driving method described in any of the above embodiments.

[0038] It should be noted that the limitations of the various steps involved in this solution, without affecting the implementation of the specific solution, are not considered to limit the order of the steps, that is, the steps written in the front can be executed first, or can be executed later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the scope of protection of this application. The inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0039] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A driving circuit for driving a display panel, characterized in that: The driving circuit includes: a leakage current generating module connected to any data line in the display panel, generating leakage current and outputting it to the connected data line; and a gate low voltage output module connected to the leakage current generating module, and generating a gate low voltage based on the current value of the leakage current generated by the leakage current generating module; Among them, the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generating module, so as to generate a corresponding gate low voltage drive signal output to the gate line of the display panel, thereby adjusting the current value of the leakage current on the data line in the display panel to the minimum value.

2. The driving circuit according to claim 1, wherein: The leakage current generating module includes a first thin film transistor, and the gate low voltage output module includes a filtering unit, a current amplifying unit, a resistance voltage dividing unit and a power chip; The control end of the first thin film transistor is connected to the power chip, the input end is connected to any data line in the display panel, and the output end is connected to the input end of the filtering unit; the output end of the filtering unit is connected to the input end of the current amplifying unit, and outputs the filtered leakage current to the current amplifying unit; the output end of the current amplifying unit is connected to the input end of the resistor divider unit, and outputs the amplified leakage current to the resistor divider unit; the output end of the resistor divider unit is connected to the power chip, and outputs the divided voltage to the power chip; Among them, the first thin film transistor is formed by the same process as the thin film transistor in the pixel, and has the same model and size, and the leakage current values ​​generated are equal. The power chip generates a corresponding gate low voltage drive signal based on the divided voltage and outputs it to the gate line of the display panel, so as to minimize the leakage current value on the data line in the display panel.

3. The driving circuit according to claim 1, wherein: The leakage current generating module includes a first thin film transistor and a second thin film transistor, and the gate low voltage output module includes a leakage current adding unit, a filtering unit, a current amplifying unit, a resistor voltage dividing unit, and a power chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are respectively the first data line and the nth data line; The control end of the first thin film transistor and the control end of the second thin film transistor are respectively connected to the power chip, the input end of the first thin film transistor is connected to the first data line in the display panel, and the input end of the second thin film transistor is connected to the nth data line in the display panel; The output end of the first thin film transistor and the output end of the second thin film transistor are respectively connected to the leakage current adding unit, and the leakage current adding unit adds the leakage currents collected from the first thin film transistor and the second thin film transistor; The output end of the leakage current adding unit is connected to the input end of the filtering unit; the output end of the filtering unit is connected to the input end of the current amplifying unit, and outputs the filtered leakage current to the current amplifying unit; the output end of the current amplifying unit is connected to the input end of the resistance voltage dividing unit, and outputs the amplified leakage current to the resistance voltage dividing unit; the output end of the resistance voltage dividing unit is connected to the power chip, and outputs the divided voltage to the power chip; Among them, the first thin film transistor and the second thin film transistor are formed by the same process as the thin film transistor in the pixel, and have the same model and size, and the leakage current values ​​generated are equal. The power chip generates a corresponding gate low voltage drive signal based on the divided voltage and outputs it to the gate line of the display panel, so as to minimize the leakage current value on the data line in the display panel.

4. The driving circuit according to claim 1, wherein: The leakage current generating module includes a pixel unit, and the gate low voltage output module includes a voltage storage unit, a switch control unit and a power supply chip. The input end of the switch control unit is connected to the pixel unit through a data line, and controls the leakage current output by the pixel unit to the data line to be input to the voltage storage unit. The power supply chip generates a corresponding gate low voltage driving signal according to the voltage value stored in the voltage storage unit and outputs it to the gate line of the display panel, so as to minimize the leakage current value on the data line in the display panel.

5. The driving circuit according to claim 2 or 3, wherein: The driving circuit also includes a temperature detection module and a brightness detection module, which are respectively connected to the current amplification unit. The temperature detection module is used to detect the temperature value of the display panel in real time and control the amplification factor of the leakage current of the current amplification unit based on the temperature value; the brightness detection module is used to detect the brightness value of the display panel in real time and control the amplification factor of the leakage current of the current amplification unit based on the brightness value.

6. The driving circuit according to claim 1, wherein: The leakage current generating module includes a first thin film transistor and a second thin film transistor, and the gate low voltage output module includes a leakage current input control unit, a filtering unit, a current amplifying unit, a resistor voltage divider unit, and a power chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are respectively a first data line and an nth data line; the leakage current input control unit includes a timing control circuit, a first switch and a second switch, and the timing control circuit outputs a switch control signal to control the conduction of the first switch and the second switch; the first switch is turned on when the voltage level is low and turned off when the voltage level is high, and the second switch is turned off when the voltage level is low and turned on when the voltage level is high; The control end of the first thin film transistor is connected to the power chip via the first switch, the control end of the second thin film transistor is connected to the power chip via the first switch, the input end of the first thin film transistor is connected to the first data line in the display panel, and the input end of the second thin film transistor is connected to the nth data line in the display panel; The output end of the first thin-film transistor and the output end of the second thin-film transistor are respectively connected to the input end of the filtering unit; the output end of the filtering unit is connected to the input end of the current amplifying unit, and outputs the filtered leakage current to the current amplifying unit; the output end of the current amplifying unit is connected to the input end of the resistor divider unit, and outputs the amplified leakage current to the resistor divider unit; the output end of the resistor divider unit is connected to the power chip, and outputs the divided voltage to the power chip; Among them, the first thin film transistor and the second thin film transistor are formed by the same process as the thin film transistor in the pixel, and have the same model and size, and the leakage current values ​​generated are equal. The power chip filters, amplifies, and divides the leakage current generated by different thin film transistors to generate a corresponding gate low voltage drive signal, which is output to the gate line of the display panel, so that the leakage current value of the data line in the display panel is minimized at different times.

7. The driving circuit according to claim 1, wherein: The driving circuit also includes a storage module, which stores a first lookup table formed based on a relationship curve between the leakage current value and the gate low voltage. The gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generating module and the first lookup table.

8. A driving method, used for driving a display panel using the driving circuit according to any one of claims 1 to 7, characterized in that: The driving method includes: Obtaining a current value of a leakage current on a data line within a display panel; The voltage value of the gate low voltage output to the gate line of the display panel is determined according to the current value of the leakage current to generate a corresponding gate low voltage drive signal output to the gate line of the display panel, thereby adjusting the current value of the leakage current on the data line in the display panel to a minimum value.

9. The driving method according to claim 8, wherein: The leakage current generating module includes a pixel unit, the gate low voltage output module includes a voltage storage unit, a switch control unit and a power chip, and the input end of the switch control unit is connected to the pixel unit through a data line; The step of obtaining the current value of the leakage current on the data line in the display panel includes: During a first time period, an unadjusted gate low voltage is output to the gate line of the display panel, a grayscale data signal corresponding to a white screen is output to the data line, and the switch control unit is controlled to be turned off; In a second time period, an unadjusted gate high voltage is output to the gate line of the display panel, a zero grayscale data signal is output to the data line, and the switch control unit is controlled to be turned on to obtain a leakage current on the data line in the display panel; The step of determining a gate low voltage value output to the gate line of the display panel based on the detected leakage current value to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and adjusting the leakage current value on the data line in the display panel to a minimum value includes: In the second time period, the voltage storage unit receives the leakage current on the data line and converts the leakage current into a corresponding voltage value; After a preset time, the voltage value of the gate low voltage output to the gate line of the display panel is determined based on the voltage value of the voltage storage unit to generate a corresponding gate low voltage drive signal output to the gate line of the display panel, thereby adjusting the current value of the leakage current on the data line in the display panel to a minimum value.

10. A display device, characterized in that: The display device includes a display panel and a driving circuit according to any one of claims 1 to 7, wherein the driving circuit drives the display panel using the driving method according to any one of claims 8 to 9.

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